78L18
D
D
D
D
D
D
3-Terminal Regulators
Output Current up to 100 mA
No External Components
Internal Thermal-Overload Protection
Internal Short-Circuit Current Limiting
Direct Replacements for Fairchild
µA78L
18
Series
Positive-Voltage Regulators
O
C
I
TO-92
78L18ACZ
description
This series of fixed-voltage integrated-circuit
voltage regulators is designed for a wide range of
applications. These applications include on-card
regulation for elimination of noise and distribution
problems associated with single-point regulation.
In addition, they can be used with power-pass
elements to make high-current voltage regulators.
One of these regulators can deliver up to 100 mA
of output current. The internal limiting and
thermal-shutdown features of these regulators
make them essentially immune to overload. When
used as a replacement for a zener diode-resistor
combination, an effective improvement in output
impedance can be obtained, together with lower
bias current.
INPUT
COMMON
OUTPUT
OUTPUT GND
INPUT
SOT-89
78L18CPK
electrical characteristics at specified virtual junction temperature, V
I
=
26V, I
o
40mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
TJ
‡
MIN
25°C
Output voltage
78L18
TYP
MAX
18.7
18.9
UNIT
17.3
17.1
18
18
I
O
=1mA to 40MA, V
I
= 20.5 to 33V
IO = 1 mA to 70 mA
VI =
20.5V to 33V
VI =
22V to 33V
VI =
21.5V to 31.5V,
f = 120 Hz
IO = 1 mA to 100 mA
IO = 1 mA to 40 mA
f = 10 Hz to 100 kHz
I
A
1 mA to 40 mA
At
Full range
Full range
25°C
25 C
25°C
25°C
25 C
25°C
25°C
25°C
125°C
V
17.1
18
70
64
18.9
360
300
dB
180
90
mV
mV
µV
V
6.5
mA
mA
mA
mA
Input
voltage regulation
Ripple rejection
Output
voltage regulation
Output
noise voltage
Dropout voltage
mV
mV
32
36
27
19
89
1.7
4.7
Bias
current
current
Bias c rrent
Bias
current change
VI =
22V to 33V
IO = 1 mA to 40 mA
Full
range
F ll
Full
6
1.5
0.1
‡ Pulse-testing techniques maintain TJ as close to TA as possible. Thermal effects must be taken into account separately. All characteristics are
measured with a 0.33-µF capacitor across the input and a 0.1-µF capacitor across the output. Full range for the 78L05 is T J = 0°C to
70°C
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage:
http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com
2-1
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